Add iOS10 helper to determine current running iOS version.

base/ios/ios_util.mm

Index: base/ios/ios_util.mm
diff --git a/base/ios/ios_util.mm b/base/ios/ios_util.mm
index bc10d19e8f6a54931a38915f83d831e14f1597ac..7af85444ada6a9fa5520d8b99ef4070e54a4b068 100644
--- a/base/ios/ios_util.mm
+++ b/base/ios/ios_util.mm
@@ -37,6 +37,10 @@ bool IsRunningOnIOS9OrLater() {
   return IsRunningOnOrLater(9, 0, 0);
 }
 
+bool IsRunningOnIOS10OrLater() {
+  return IsRunningOnOrLater(10, 0, 0);
+}
+
 bool IsRunningOnOrLater(int32_t major, int32_t minor, int32_t bug_fix) {
   static const int32_t* current_version = OSVersionAsArray();
   int32_t version[] = {major, minor, bug_fix};